Engine-brake.



Patented Mar. 4, I902.

E. Y. MOORE.

ENGINE BRAKE.

(Applicatio n filed Apr. 19, 1901.)

(No Model.)

UNITED STATES PATENT OFFICE.

EDWARD Y. MOORE, OF CLEVELAND, OHIO, ASSIGNOR, BY MESNE ASSIGN- MENTS,TO CHICAGO PNEUMATIC TOOL COMPANY, A CORPORATION OF NEW JERSEY. I

ENGINE-BRAKE.

SPECIFICATION forming part of Letters Patent No. 694,403, dated March 4,1909. Application filed April 19, 1901. Serial No. 56,598 (No model.)

scription, reference being had to the accompanying drawings.

In using hoisting engines or motors driven by compressed air it iscommon practice for the operator to maintain the load in an ele vatedposition by shutting off the incoming air to the motor-cylinder andrelying upon the air entrapped within the cylinder to sustain the loadwhich has been elevated; but it is found very difiicult to prevent theair so entrapped from leaking past the piston and permitting the load tosink. This sinking may be obviated by providing anautomatically-operated brake for holding the mechanism of the motorfixed against movement by the load when the elevating operation ceases.

The object of the present invention is to provide such a brake adaptedfor use with an .incas'ed motor which, while being very efficient inservice, shall require few extra parts and no extra room. Inaccomplishing this I provide an extra crank-disk for the motor, whichserves the double purpose of supporting one end of the crank-pin and ofcarrying a braking-surface.

The invention includes the employment of such a disk broadly and themore specific embodiment of it as hereinafter shown and described.

In the drawings, Figure 1 is a front elevation of an air-hoistconstructed in accordance with my invention. Fig. 2 represents the samewith its cover-plate removed. Fig. 3 is an elevation of the inner sideof the coverplate. Fig. at is a bottom plan of the motor, the casingbeing partly broken away to disclose the interior. Fig. 5 is a verticalcen tral section through the main or reversing valve and cover-plate,showing my brake in its relation to the valve. Fig. 6 is a verticalsection at right angles to the plane of that taken in Fig. 5. Fig. 7 isan enlarged detail of the brake-band. Fig. 8 is a horizontal section ofthe collar which embraces the lower end of the valve.

As shown in the drawings, A represents a casing in which are mounted thetwo oscillating cylinders O 0, whose piston-rods K K connect with acommon crank-pin d upon the crank-disks D D. These cylinders areprovided with finished fiat faces a 0, containing ports 0, whichcooperate with properly-connected port-openings in the cover-plate U, soas to control the admission and exhaust of air from the cylinders O, andport-openings u, communicating with these, open into a valve-chamber aBetween these port-openings u it lies an exhaust-port u whichcommunicates with the outer air. The portopenings are connected bypassages in the cover. (Shown by the dotted lines in Fig. 3.)

The valve shown consists of a hollow tubular body V, adapted to receivethe air from below (through a flexible hose screwed into it) andprovided with ports U 2;, cut through its wall,which maycommunicate,respectively, with the'port-openings a u, and when either ofthese ports 2; is thus placed the other port a communicates with theexhaust-passage u via the recess 0) in the outer wall of the valve. Thevalve V is provided on one side with rack-teeth 12 which are inengagement with a segmental gear 0 This segmental gear is rigidlysecured to a pin 12 which pin is'pivoted in the housing 10 (part of thecover U) and carries rigidly an operating-lever Q2 The head of a plunger'v",which is constrained by a spring o contacts with this segmental gearin a manner adapted to maintain the valve V normally in mid-position,giving it a tendency to return thereto when moved in either direction.

I will now describe the parts of my invention as I apply it to a motorof the kind I have above described.

The crank-disk D is rotatably journaled upon a stub-shaft d mounted inthe upper cover U. This disk receives the end of the crank-pin clloosely to allow the convenient removal of the cover-plate. Theperiphery of this disk D is enveloped in a brake-strap E. This strap maybe held in position by a light flange d on the disk D. Its constructionis best shown in Fig. 7. It consists of an incomplete metal hoop, at theopening e of which are formed two outward extensions or noses e. Themetal of this hoop is preferably deepest at a point opposite thisopening, and the bore 6 of this strap is of slightlysmaller diameterthan the disk D, whereby it normally grasps the periphery of the same. Ablock f is rigidly mounted upon a rotatable pin F in the uppercover-plate, and this block lies in the opening 6 referred to above. Itmay be of any convenient eccentric shape, as the rectangular form shown,so that if the pin F, which supports it, is slightly rotated theopposite ends of the block will force apart the noses e and expand thestrap E so that its grasp upon the disk D is relaxed.

The pin F carries on its outer end a leverarm. f, which extends throughthe swiveled eye 9 on the collar G, which is secured to the lower end ofthe valve V, as by a set-screw g. The idle position of the lower blockf, as shown in Fig. 7, corresponds to the ofi position of the valve,while any movement of the valve operates to displace the arm f, and thistips the block f, with the effects noted above. Hence when the motor isat rest the disk D is under restraint of the brake-strap E; but uponmoving the valve V to start the motor and as long as the motor isrunning the restraint of the brake-strap is automatically removed. 'Whenthe load has been elevated and the air shut off, the brake prevents thesettling of the load due to slight leakage of the air past the pistons,as would otherwise result.

What I claim is 1. The combination of an incased engine, an additionalcrank-disk therefor within the casing, said crank-disk removablyengaging the crank-pin, and means for establishing braking frictionalengagement between said disk and a non-rotative member, substantially asdescribed.

2. The combination of a casing with an engine within the casing drivinga crank and crank-pin, a crank-shaft for said crank at the side of thecasing opposite the cover, a crankdisk carried by the cover and axiallyalined with the crank-shaft, said crank-disk removably engaging the endof the crank-pin, and means for establishing braking friction betweensaid disk and a non-rotative body, substantially as described.

axially with the crank-shaft on the inner side of the cover-plate, saidcrank-disk having an opening loosely receiving the end of the crankpin,and mechanism for applying braking friction to said crank-disk, wherebythe disk serves the double purpose of an additional support for thecrank-pin and of a brake but may be removed with the cover,substantially as described.

4. The combination of a casing and coverplate therefor, with an enginewithin the casing driving a suitable crank and crank-pin, a crank-diskon the inner side of the coverplate journaled on a stub-shaft carried bythe cover-plate, said crank-disk removably receiving the end of saidcrank-pin, a brakestrap surrounding said crank-disk and mechanismextending through said cover for operating said brake, substantially asdescribed.

5. In a motor, in combination, a casing, a cylinder, piston, crank, andcrank-pin therein, a cover-plate for the casing, a crank-disk on theinner side of the cover-plate journaled on a stub-shaft carried thereby,a resilient brake-strap surrounding said disk, a block for releasingsaid strap, and a pin extending through said cover-plate for operatingsaid block from the outside, substantially as described.

6. The combination of a casing including a cover, with a cylinder,piston, crank and crank-pin within the casing,and a disk within thecasing journaled axially with the crankshaft and engaging the crank-pin,said disk carrying a friction-surface, mechanism for causing engagementbetween such surface and another surface to establish frictionalbraking, a valve for governing the motor and a connection between it andsuch mechanism, substantially as described.

7. In a motor, in combination, a casing, a crank-disk therein,aresilient brake normally in contact with the peripheral surface thereof,a rotatable pin extending through the easing and adapted to release saidbrake, an arm carried by said pin, a valve adapted to control theoperation of said motor, said arm being mechanically connected to saidvalve, substantially as described.

8. In a motor, in combination, a disk adapted to rotate when the motoroperates, a re silient brake-strap enveloping the peripheral facethereof, said strap having an opening through it, a block occupying saidopening and adapted to move therein to expand-the strap, a valve forcontrolling said motor, and an operative lever mechanically connectedwith both said valve and said block and adapted to simultaneously movethe two, substantially as described.

9. The combination of a casing including a cover-plate, an engine withinthe casing, a reversing-valve on the outer side of the cover forcontrolling the engine, a crank-disk within the casing engaging thecrank-pin, a resilient brake normally applied to said disk within thecasing, a rotatable pin extending through the cover and adapted torelease said brake, and a lever on the outer end of said coverconnecting with said valve whereby the movement of the valve releasesthe brake, eye whereof receives said arm, and means for substantially asdescribed. shifting said valve,substantially as described. 10

10. In a motor, in combination, a crank- In testimony whereof I hereuntoaffix my disk, a resilient brake normally in contact signature in thepresence of two witnesses. 5 therewith, a rotatable pin, a block rigidwith EDWARD Y. MOORE.

said pin which may release said brake, an arm Witnesses: carried by saidpin, a valve, an eyebolt whose ALBERT H. BATES,

shank is rotatably mounted on said valve, the l H. M. WISE.

